TWI438485B - Light source unit and projector - Google Patents

Description

Light source device and projector

The present invention relates to a light source device and a projector including the same.

Nowadays, a data projector as an image projection device has been widely used for projecting a screen of a personal computer or a video image, and even an image of image data stored in a memory card or the like on a screen. The projector condenses the light emitted from the light source onto a micromirror display element or a liquid crystal panel called a DMD (Digital Micromirror Device) to display a color image on the screen.

In such projectors, conventionally, high-intensity discharge lamps have been used as light sources. However, in recent years, various solutions using light-emitting diodes, laser diodes, organic ELs, and phosphors have been developed as light sources. . For example, Japanese Laid-Open Patent Publication No. 2004-341105 proposes a light source device including a fluorescent turntable formed of a disk-shaped transparent substrate provided with a phosphor layer, wherein the phosphor layer receives The solid-state light source emits ultraviolet light as excitation light and is converted into visible light. However, the ultraviolet light as the excitation light is irradiated onto the phosphor layer formed on the turntable surface, and although the red, green, and blue wavelength ranges of the fluorescent light can be emitted, the red fluorescent body has higher luminous efficiency than the other fluorescent materials. The luminous efficiency is low, so there is a problem that the red brightness is insufficient.

The present invention has been made in view of the above problems in the prior art, and an object of the invention is to provide a light source device and a projector including the same, wherein the light source device includes a fluorescent turntable and has good luminous efficiency. A type of phosphor; a light source for exciting a phosphor; and a monochromatic light source for emitting a wavelength range of light corresponding to a type of phosphor having a low luminous efficiency; and the above configuration improves the brightness of the screen.

A light source device and a projector according to the present invention are characterized in comprising: a light-emitting panel having a plurality of segmented regions on a substrate, and at least one of the plurality of segmented regions as a reflecting portion formed in the reflecting portion a phosphor layer that receives excitation light and emits light of a predetermined wavelength range, and at least one of the plurality of segment regions serves as a light transmissive portion that transmits light; and the first light source emits light toward the phosphor a second light source emitting light of a wavelength range different from the fluorescent light emitted from the phosphor layer and the excitation light emitted from the first light source; the collecting optical system is configured to emit light emitted from the light emitting plate and The light emitted from the second light source is condensed on the same optical path; and the light source control means controls the light emission of the first light source and the second light source.

The invention is to be understood as being limited by the following description and the appended claims.

Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. However, the embodiments described below are not limited to the following embodiments and illustrations, which are technically suitable for the implementation of the present invention.

The projector 10 of the present invention includes a light source device 63, a display element 51, a cooling fan, and a light source side optical system 62 that guides light from the light source device 63 toward the display element 51, and a projection side optical system 90 that will display The image emitted by the component 51 is projected on the screen; the projector control means is used to control the light source device 63 and the display element 51; and the light source control circuit 41 is used as a light source control means for controlling the first light source 72 of the light source device 63. And the illumination of the second light source 82.

The light source device 63 has a fluorescent dial 71 as a light-emitting panel. The fluorescent turntable 71 has two adjacent semi-circular segmented regions on the rotatably controlled substrate. A segmented region, that is, the first region 1, is formed as a reflecting portion, and a phosphor layer 131 that receives excitation light and emits light of a green wavelength range is formed in the reflecting portion. The other segmented region, that is, the second region 2, serves as a light transmitting portion to allow light to pass through. The light source device 63 includes a first light source 72 that emits excitation light in a visible light region, and a second light source 82 that emits fluorescence light emitted from the phosphor layer 131 and excitation light emitted from the first light source 72. The light of different wavelength ranges; and the collecting optical system condense the light emitted from the fluorescent turntable 71 and the light emitted from the second light source 82 on the same optical path.

The collecting optical system includes a first optical axis conversion mirror 151a and second to fourth optical axis conversion mirrors 151b, 151c, and 151d. The first optical axis conversion mirror 151a is disposed between the first light source 72 and the fluorescent dial 71 to cause the excitation light and the light from the second light source 82 to penetrate and reflect the fluorescent light from the phosphor. The second to fourth optical axis conversion mirrors 151b, 151c, and 151d are configured to transmit excitation light that passes through the light transmitting portion of the fluorescent disk 71, fluorescent light that is reflected by the first optical axis conversion mirror 151a, and The plurality of mirrors and dichroic mirrors that are emitted by the two light sources 82 are collected on the same optical path and can be emitted in the same direction.

The substrate used for the first region 1 is an opaque substrate composed of a thermally conductive member such as a copper plate or aluminum, and the substrate for the second region 2 is formed of a glass substrate or a transparent resin substrate. Further, a surface on the side of the phosphor layer 131 is disposed on the base material of the first region 1 as the reflecting portion, and a reflecting layer for reflecting light is formed by silver vapor deposition or the like, and a phosphor layer is formed on the reflecting layer. 131.

Further, a diffusion layer 141 that diffuses light from the first light source 72 is formed on the substrate as the second region 2 of the light transmitting portion.

Further, the first light source 72 is a laser illuminator for emitting light of a blue wavelength range having a wavelength shorter than a wavelength of light of a green wavelength range emitted by the green phosphor layer 131. The second light source 82 emits a light-emitting diode of red wavelength range light.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external perspective view of the projector 10. Further, in the present embodiment, the left and right directions indicate the horizontal direction with respect to the projection direction, and the front and rear directions indicate the front-rear direction with respect to the traveling direction of the light beam emitted from the projector 10. As shown in Fig. 1, the projector 10 has a substantially rectangular parallelepiped shape, and has a lens cover 19 for covering the projection opening on the side of the front panel 12 which is a side panel of the front side of the casing body, and the front panel 12 is provided with plural Vents 17 are provided. Further, although not shown, an Ir receiving unit that receives a control signal from the remote controller is provided.

Further, a key/indicator portion 37 is provided on the upper panel 11 as a casing body. A power switch, a power indicator for notifying whether the power is turned on or off, a projection switch for switching the switching on or off, a light source device, a display element, or a control circuit are disposed on the key/indicator portion 37. A key or indicator such as a superheat indicator for notification when overheating occurs.

Further, on the back surface of the casing body, various terminals 20 such as an input/output connector unit for providing a USB terminal or a video signal input D-SUB terminal, an S terminal, an RCA terminal, and the like, and a power adapter plug are provided. . Further, a plurality of intake holes 18 are formed in the vicinity of the lower portion 14 of the left side panel 15 which is a side plate of the casing body (not shown) and the lower portion of the left side plate 15 which is a side plate shown in Fig. 1 .

Next, the projector control means of the projector 10 will be described using the block diagram of Fig. 2. The projector control means is composed of a control unit 38, an input/output interface 22, a video conversion unit 23, a display encoder 24, a display drive unit 26, and the like, and various types of video signals input from the input/output connector unit 21 are transmitted through the input. The output interface 22 and the system bus (SB) are converted by the video conversion unit 23 so as to be unified into a video signal of a predetermined format suitable for display, and then output to the display encoder 24.

Further, when the input image signal is developed and stored in the video RAM 25, the display encoder 24 generates a video signal from the stored content of the video RAM 25 and outputs it to the display drive unit 26.

The display drive unit 26 corresponds to the video signal output from the display encoder 24, and drives the display element 51 as a spatial light modulation element (SOM) at a suitable frame rate, which is emitted from the light source device 63 through the light source side optical system. The light beam is incident on the display element 51, whereby the light image is formed by the reflected light of the display element 51, and transmitted through the projection system lens group as the projection side optical system, and the image is projected and displayed on a screen (not shown). Further, the movable lens group 97 of the projection side optical system is driven by the lens motor 45 for zoom adjustment or focus adjustment.

Further, the image compression/decompression unit 31 performs a recording process of sequentially writing a luminance signal and a color difference signal of the video signal to the memory card 32, and the memory card 32 performs processing on the data by processing such as ADCT and Huffman coding. Compressed to become a freely detachable recording medium. Further, the video compression/decompression unit 31 reads the video data recorded on the memory card 32 in the playback mode, and decompresses each of the video data constituting the series of animations in units of one frame, and transmits the video data to the video conversion unit 23 through the video conversion unit 23. The image data is output to the display encoder 24, and processing for displaying an animation or the like is performed based on the image data stored in the memory card 32.

The control unit 38 controls the operation of each circuit in the projector 10, and is constituted by a CPU, a ROM that stores an operation program such as various settings, and a RAM used as a working memory.

The operation signal of the key/indicator portion 37 formed by the main key and the indicator of the upper panel 11 of the casing body is directly sent to the control unit 38, and the key operation signal from the remote controller is received by the Ir receiving unit 35. The code signal demodulated by the Ir processing unit 36 is output to the control unit 38.

Further, the control unit 38 is connected to the sound processing unit 47 via the system bus bar (SB). The sound processing unit 47 includes a sound source circuit such as a PCM sound source, and compares the sound data in the projection mode and the playback mode, and drives the speaker 48 to perform sound amplification.

Further, the control unit 38 controls the power source control circuit 41 as a light source control means for controlling the light emission of the first light source and the second light source of the light source device 63 based on the image signal. Further, the control unit 38 causes the cooling fan drive control circuit 43 to perform temperature detection of a plurality of temperature sensors provided in the light source device 63 or the like, and controls the rotational speed of the cooling fan based on the temperature detection result. Further, the control unit 38 continues to cool the rotation of the fan after the power of the projector body is turned off by the cooling fan drive control circuit 43 or the like, or cuts off the projector body based on the temperature detection result of the temperature sensor. Control of power supply, etc.

The internal structure of the projector 10 will be described. FIG. 3 is a schematic plan view showing the internal structure of the projector 10. As shown in FIG. 3, the projector 10 is provided with a power supply control circuit board 102 on which the power supply circuit block 101 or the like is mounted in the vicinity of the right side panel 14, and a multi-blade air blower 110 is disposed substantially at the center, and is disposed near the air blower 110. In the control circuit board 103, the light source device 63 is disposed in the vicinity of the front panel 12, and the optical system unit 70 is disposed in the vicinity of the left panel 15. Further, the projector 10 partitions the airtight portion of the casing into the intake side space chamber 121 on the back panel 13 side and the exhaust side space chamber 122 on the front panel 12 side by the partition wall 120, and the blower 110 is disposed. The suction port 111 is located at the intake side space chamber 121, and the discharge port 113 is located at the boundary between the exhaust side space chamber 122 and the intake side space chamber 121.

The optical system unit 70 is substantially U-shaped by the following three blocks, that is, the illumination side block 78 is located in the vicinity of the light source device 63; the image generation block 79 is located on the back panel 13 side; and the projection The side block 80 is located between the illumination side block 78 and the left side panel 15.

The illumination side block 78 has a part of the light source side optical system 62 that guides the light emitted from the light source device 63 to the display element 51 included in the image generation block 79. As the light source side optical system 62 of the illumination side block 78, the light guiding means 75 which forms a light beam which is emitted from the light source means 63 into a uniform intensity distribution, or the light which penetrates the light guiding means 75 A condensing lens of light, etc.

The image generation block 79 is a light source side optical system 62, and includes an optical axis changing mirror 74 for changing the optical axis direction of the light beam emitted from the light guiding device 75, and a plurality of collecting lenses for using the light. The light reflected by the axis changing mirror 74 is condensed on the display element 51; and the illuminating mirror 84 illuminates the display element 51 with a light beam that penetrates the condensing lens at a predetermined angle. Further, the image generation block 79 has a DMD as the display element 51, and a display element cooling device 53 for cooling the display element 51 is disposed on the back panel 13 side of the display element 51 to prevent the display element 51 from becoming high temperature.

The projection side block 80 has a lens group that projects the projection side optical system 90 on which the light reflected by the display element 51 is formed on the screen. The projection side optical system 90 includes a fixed lens group 93 built in a fixed lens barrel and a movable lens group 97 built in the movable lens barrel, and is a zoom type lens having a zoom function, and a movable lens is provided by a lens motor. Group 97 moves for zoom adjustment or focus adjustment.

Further, in the internal structure of the projector 10, a member which is lower in temperature than the light source device 63 is disposed in the intake side space chamber 121, specifically, the power supply control circuit substrate 102, the blower 110, the control circuit substrate 103, and the optical device are disposed. The image generation block 79 of the system unit 70, the projection side block 80 of the optical system unit 70, and the condensing lens in the illumination side block 78 of the optical system unit 70.

On the other hand, in the exhaust side space chamber 122, a relatively high-temperature light source device 63, a light guiding device 75 provided in the illumination side block 78 of the optical system unit 70, and an exhaust temperature reducing device 114 are disposed.

Further, the light source device 63 includes a fluorescent dial 71 which is a light-emitting panel that emits green and blue wavelength range light of the primary color by irradiation of light, and a turntable motor 73 that drives the fluorescent turntable 71 in a rotational manner; The first light source 72 illuminates the blue wavelength range light toward the fluorescent turntable 71; and the second light source 82 emits the red wavelength range light of the primary color.

Further, the plurality of first light sources 72 are disposed such that the optical axes of the respective first light sources 72 are substantially parallel to the optical axis of the light guiding device 75. The second light source 82 is also disposed such that the optical axis of the second light source 82 is substantially parallel to the optical axis of the light guiding device 75. Further, the fluorescent dial 71 is disposed such that the optical axis of the first light source 72 is substantially perpendicular to the disk surface of the fluorescent dial 71, and the optical axis of the first light source 72 is converted by the mirror group 160 by 90 degrees. direction. That is, the rotation axis of the turntable motor 73 that rotates the fluorescent dial 71 is parallel to the optical axis of the first light source 72 converted by the mirror group 160.

The first light source 72 is a laser illuminator that emits blue wavelength range light for illuminating the phosphor layer and the diffusion layer disposed in the vicinity of the outer peripheral portion of the phosphor disk 71 to be described later. It is visible light having a wavelength shorter than the wavelength of the green wavelength range light emitted from the phosphor layer. In addition, the second light source 82 is a red light emitting diode that emits light of a red wavelength range.

As shown in Figs. 4(a) and 4(b), the fluorescent dial 71 as a light-emitting panel is formed in a central portion of a circular thin plate-like substrate having a phosphor layer 131, and is connected to the turntable motor 73. a circular opening corresponding to the shape of the cylindrical rotating shaft, the fluorescent turntable 71 is firmly connected to the turntable by inserting the rotating shaft into the circular opening and attaching the motor hub to the vicinity of the central portion of the substrate The motor 73 is on the rotating shaft.

Therefore, the fluorescent dial 71 is integrally rotated in the circumferential direction by the turntable motor 73. The turntable motor 73 is a drive device that is driven and controlled by the control unit 38 of the projector control means at a rotational speed of about 120 revolutions per second. That is, the fluorescent turntable 71 is designed to be a rotatable controller.

The substrate has two semi-circular segmented regions that abut each other. A segmented area, i.e., the first area 1, serves as a reflecting portion. The base material of the first region 1 as the reflecting portion is made of an opaque base material made of a heat conductive member such as a copper plate or aluminum, and is deposited by silver on the surface on the side of the first light source 72 on which the phosphor layer 131 is formed. A reflective layer for reflecting blue light source light from the first light source 72 and fluorescent light of a green wavelength range generated by the phosphor is formed, and a phosphor layer 131 is formed on the reflective layer.

Further, a strip-shaped recess is formed in the vicinity of the outer peripheral portion of the first region 1 of the substrate, and a phosphor layer 131 is formed in the recess. The phosphor layer 131 includes a layer that emits light from the first light source 72, absorbs light from the first light source 72 as excitation light, and emits a phosphor of green wavelength range light of a primary color by excitation. Further, the phosphor layer 131 is composed of a phosphor crystal and a binder.

The other segment region in which the phosphor layer 131 is not disposed, that is, the second region 2, serves as a light transmitting portion to allow the blue light of the first light source 72 to penetrate. The second region 2, which is the light transmitting portion, has a diffusion layer 141 on the surface on the side of the first light source 72. Specifically, the diffusion layer 141 is formed by optical treatment such as rough surface treatment such as sandblasting on the second region 2 of the transparent substrate, and can be used as light penetration of the incident blue light source. A layer that imparts a diffusing effect.

Further, as the diffusion layer 141, in addition to the case where the surface of the transparent substrate is subjected to optical treatment, it may be formed by adhering a band-like solid material of an optical substance. Further, the diffusion layer 141 may be formed on the surface opposite to the first light source 72 instead of the diffusion layer 141 on the surface on the side of the first light source 72.

In this manner, since the phosphor layer 131 and the diffusion layer 141 are disposed adjacent to each other in the circumferential direction in the two segment regions, the phosphor layer 131 and the diffusion layer 141 of the rotating fluorescent disk 71 are sequentially irradiated with blue. When the light source light is emitted from the first light source 72 as the excitation light and is incident on the phosphor layer 131 of the fluorescent disk 71, the fluorescent light of the green wavelength range is emitted from the fluorescent disk 71 toward the first light source 72 side. When the light source light emitted from the first light source 72 is irradiated onto the diffusion layer 141 of the light transmitting portion of the fluorescent disk 71, the blue light source light from the first light source 72 penetrates and diffuses toward the side opposite to the first light source 72.

In other words, the light source device 63 can emit green fluorescent light from the phosphor layer 131 formed on the reflecting portion of the fluorescent disk 71 by irradiating the light from the first light source 72 onto the rotating fluorescent disk 71. The light is separated from the blue light source that penetrates the light transmitting portion of the fluorescent disk 71 having the diffusion layer 141 and is emitted.

Specifically, the phosphor of the phosphor layer 131 absorbs blue light source light as excitation light and emits fluorescent light of a green wavelength range in all directions. The green fluorescent light emitted toward the first light source 72 is incident on the light guiding device 75 through a collecting optical system to be described later, and the green fluorescent light emitted to the substrate side is reflected by the reflective layer. Most of the reflected light is emitted as light from the fluorescent disk 71, and is incident on the light guiding device 75 through the collecting optical system.

Further, the blue light source light that is not absorbed by the phosphor of the phosphor layer 131 and is irradiated onto the reflective layer is also reflected by the reflective layer, and is again emitted to the side of the phosphor layer 131 to excite the phosphor, thereby improving the blue color. The light source light is utilized efficiently, and the light can be brightly emitted.

Further, the blue light source light reflected by the reflective layer but not absorbed by the phosphor and returned from the phosphor layer 131 to the first light source 72 side travels from the phosphor layer 131 to the first light source 72 side together with the green fluorescent light. The blue source light is separated from the green fluorescent light by a dichroic mirror that reflects green light and allows the blue light to pass through. That is, only green fluorescent light emitted from the fluorescent dial 71 to the first light source 72 side is reflected by the dichroic mirror, and is incident on the light guiding device 75 through the other mirror or lens of the collecting optical system. .

Further, when the laser beam of the blue wavelength range is irradiated onto the diffusion layer 141 from the first light source 72, the diffusion layer 141 imparts a diffusion effect to the incident blue light source light, and thus the emitted light from the phosphor layer 131 is emitted ( The green light of the same diffused light is emitted from the diffusion layer 141, and the blue light is transmitted to the light guiding device 75 through the collecting optical system.

Here, as another embodiment of the fluorescent dial 71, all the base materials of the fluorescent dial 71 are formed of a transparent substrate such as glass or a transparent resin, and a phosphor layer 131 is formed on the surface opposite to the first light source 72. Further, only the light of a specific wavelength range is reflected between the phosphor layer 131 of the transparent substrate and the first light source 72. Specifically, a color separation layer that penetrates the excitation light component and reflects light of other wavelength range components is formed as a reflection. unit. With such a configuration, the excitation light from the first light source 72 can be transmitted to the phosphor layer 131, and the dichroic layer can reflect the light emitted from the phosphor layer 131 in all directions to enhance the fluorescent light. The composition of the utilization efficiency.

However, as in the present embodiment, by using the base material of the base portion of the phosphor layer 131 on which the fluorescent dial 71 is provided as the reflecting portion, it is not reflected on the surface of the fluorescent dial 71 and only reflects the base as a transparent substrate. The special reflection layer of light of a specific wavelength range required at the time can separate the emission light path of the blue light source and the green fluorescent light emitted from the fluorescent disk 71, and can be a light source device 63 which is simple in construction and easy to manufacture.

Further, when the base portion is provided as a transparent substrate, the color separation layer needs to be penetrated by the excitation light, so that the blue light that is not absorbed by the phosphor of the phosphor layer 131 cannot be used, but the present embodiment is similar to this embodiment. In the case where the base portion is used as the reflection portion, the excitation light that is irradiated to the base portion is reflected and returned to the phosphor layer 131 without being absorbed by the phosphor of the phosphor layer 131. Therefore, it is not necessary to add special optical components (for example, The transparent substrate provided with the excitation light reflection layer on the emission side of the transparent substrate having the phosphor layer can improve the utilization efficiency of the excitation light from the first light source 72, and can emit light more brightly.

Further, as shown in FIG. 5, the light source device 63 includes a collimator lens 150 disposed on the emission side of the first light source 72 and converting the light emitted from the first light source 72 into parallel light, and a mirror group 160. It is disposed on the optical axis of the first light source 72 and reflects the light from the first light source 72 in a direction that is changed by an angle of 90 degrees. Further, the light source device 63 includes a collecting optical system including a dichroic mirror and a reflecting mirror that reflects or penetrates light of a predetermined wavelength range emitted from the fluorescent dial 71 and the second light source 82, and causes The blue light and the green light of the fluorescent dial 71 and the red light from the second light source 82 are collected on the same optical path; and the lens or the like is applied to the light beam that is emitted from the fluorescent turntable 71 and enters the light guiding device 75. Spotlight.

Hereinafter, the concentrating optical system of the present embodiment will be described. The collecting optical system includes four optical axis changing mirrors 151, which are optical axes of green fluorescent light and blue light source lights separated by emitting the fluorescent rotating disks 71 in different directions. The optical axis of the red light source light emitted from the second light source 82 is converted to match, and is arranged at a predetermined position so that the respective color lights are collected on the same optical path.

Specifically, the collecting optical system includes a first optical axis conversion mirror 151a and second to fourth optical axis conversion mirrors 151b, 151c, and 151d. The first optical axis conversion mirror 151a is disposed between the first light source 72 and the fluorescent dial 71, and transmits dichroic mirrors through which the excitation light penetrates and reflects the fluorescent light from the phosphor. The second to fourth optical axis conversion mirrors 151b, 151c, and 151d are excitation light that penetrates the light transmitting portion of the fluorescent disk 71, fluorescent light that is reflected by the first optical axis conversion mirror 151a, and second light. The plurality of mirrors and dichroic mirrors that are emitted by the light source 82 are collected on the same optical path and can be emitted in the same direction.

The first optical axis conversion mirror 151a is disposed on the optical axis of the first light source 72 that is changed by an angle of 90 degrees by the mirror group 160 and is disposed on the optical axis of the second light source 82, and is disposed on the first light source 72 and the fluorescent turntable. 71 between and between. Further, the first optical axis conversion mirror 151a does not change the blue light source light (excitation light) reflected by the mirror group 160 and the optical axis of the second light source 82, and causes the green fluorescent light emitted from the fluorescent disk 71 to be emitted. The optical axis is transformed by a 90 degree dichroic mirror. In other words, the first optical axis conversion mirror 151a penetrates the blue light source light as the excitation light emitted from the first light source 72 and the red light source light from the second light source 82, and causes the phosphor layer from the fluorescent disk 71 to pass through. The fluorescent light of the green wavelength range emitted by the phosphor of 131 is changed by an angle of 90 degrees and then reflected.

The second optical axis conversion mirror 151b is disposed on the optical axis of the first light source 72 converted by the mirror group 160, and is disposed on the opposite side of the first light source 72 with respect to the fluorescent dial 71, and allows the penetration of the fluorescent light. The optical axis of the blue light source light of the diffusion layer 141 of the light transmitting portion of the light-rotating disk 71 is converted into a normal mirror of 90 degrees. In other words, the second optical axis conversion mirror 151b reflects the angle of the blue light emitted from the fluorescent disk 71 by an angle of 90 degrees. Further, the second optical axis conversion mirror 151b may not be used as a mirror, but may be a dichroic mirror that can reflect blue light.

The third optical axis conversion mirror 151c is on the optical axis of the green fluorescent light converted by the first optical axis conversion mirror 151a (that is, on the optical axis of the second light source 82), and is paired with the first optical axis conversion mirror 151a. The mirror is arranged to convert the fluorescent light converted by the first optical axis conversion mirror 151a and the optical axis of the second light source 82 by 90 degrees. In other words, the third optical axis conversion mirror 151c reflects the fluorescence light of the green wavelength range reflected by the first optical axis conversion mirror 151a and the red light source light from the second light source 82 by only changing the angular direction of 90 degrees. Further, the third optical axis conversion mirror 151c may not be used as a mirror, but may be a dichroic mirror that can reflect green light and red light.

The fourth optical axis conversion mirror 151d is disposed to face the second optical axis conversion mirror 151b and the third optical axis conversion mirror 151c, and does not change the optical axis of the blue light source light converted by the second optical axis conversion mirror 151b. Further, the dichroic mirror of the red and green fluorescent light converted by the third optical axis conversion mirror 151c is converted by 90 degrees. In other words, the fourth optical axis conversion mirror 151d is disposed on the optical axis of the blue light source light reflected by the second optical axis conversion mirror 151b and the green fluorescent light and the red light source light reflected by the third optical axis conversion mirror 151c. The position where the axes intersect is such that the blue light source reflected by the second optical axis conversion mirror 151b penetrates and advances, and the light of the red and green wavelength ranges reflected by the third optical axis conversion mirror 151c changes only 90 degrees. Reflected after the angular direction.

Thereby, the blue light source light that has passed through the fourth optical axis conversion mirror 151d and the red light source light and the green fluorescent light that is reflected by the fourth optical axis conversion mirror 151d are collected on the same optical path, and all of these are The light of the light shines in the same direction.

In this manner, four optical axis conversion mirrors 151 are disposed in the collecting optical system, and the light source device 63 causes the optical axes of the blue light and the green light emitted from the fluorescent disk 71 and the optical axis of the red light emitted from the second light source 82. The light is aligned with the optical axis of the light guiding device 75, whereby the respective color lights can be condensed on the same optical path and irradiated in the same direction. Therefore, the respective color lights emitted from the light source device 63 can be sequentially incident on the light guiding device 75. .

Further, as described above, the concentrating optical system is disposed on the path between the first light source 72 and the fluorescent dial 71, and the fluorescent light from the fluorescent dial 71 or the light source that penetrates the fluorescent dial 71. A lens and a mirror formed by combining a lens such as a dichroic mirror to condense the light. Thereby, the light beam that has changed the traveling direction of the mirror is condensed by the lens, and the light can be efficiently incident on the light guiding device 75.

Specifically, the blue light emitted from the plurality of first light sources 72 is formed by the collimator lens 150 as parallel light having increased directivity, and is disposed in the mirror group 160 and the first optical axis conversion mirror 151a. The first convex lens 153a is condensed. In addition, since the collecting lens group 155 is disposed in the vicinity of the front and back sides of the fluorescent dial 71, the blue light collected by the first convex lens 153a is brought to light, and is again collected by the collecting lens group 155. Each of the light beams emitted from the front and back sides of the fluorescent dial 71 is also condensed. Similarly, the condensing lens group 155 is disposed in the vicinity of the exit surface of the second light source 82, so that the light beam emitted from the second light source 82 is condensed and then irradiated onto the first optical axis conversion mirror 151a.

Further, a second convex lens 153b is disposed between the second optical axis conversion mirror 151b and the fourth optical axis conversion mirror 151d, and a third convex lens 153c is disposed between the first optical axis conversion mirror 151a and the third optical axis conversion mirror 151c. The fourth convex lens 153d is disposed between the third optical axis conversion mirror 151c and the fourth optical axis conversion mirror 151d, and the light guide device is placed between the fourth optical axis conversion mirror 151d and the light guiding device 75 to enter the lens 154. The light emitted from the fluorescent dial 71 can be incident on the light guiding device 75 as a concentrated light beam.

Therefore, the blue light source light emitted from the first light source 72 through the collimator lens 150 is condensed by the first convex lens 153a, penetrates the first optical axis conversion mirror 151a, and is re-aggregated in the condensing lens group 155. After the light, the phosphor layer 131 or the diffusion layer 141 of the fluorescent disk 71 is irradiated.

Further, when the light source light is applied to the diffusion layer 141 of the second region 2 which is the light transmitting portion of the fluorescent disk 71, the diffusion layer 141 is passed through to diffuse the blue light source light, and is disposed on the fluorescent disk 71. The condenser lens group 155 in the opposite direction on the first light source 72 side is condensed and irradiated to the second optical axis conversion mirror 151b. In addition, the blue light source light is reflected by the second optical axis conversion mirror 151b and condensed by the second convex lens 153b, passes through the fourth optical axis conversion mirror 151d, and is incident on the light guiding device into the lens 154, and then is incident on the light guide. Light device 75.

Further, when the light source light is irradiated onto the phosphor layer 131 of the first region 1 which is the reflection portion of the fluorescent disk 71, the fluorescent light of the green wavelength range is emitted toward the first light source 72 side. On the other hand, the fluorescent light is collected by the collecting lens group 155 on the first light source 72 side of the fluorescent dial 71 and is irradiated onto the first optical axis conversion mirror 151a. Here, although the fluorescent light is reflected by the first optical axis conversion mirror 151a, the blue light source light that is not absorbed by the phosphor of the phosphor layer 131 and reflected is transmitted through the first optical axis conversion mirror 151a. . Thereby, the green fluorescent light can be separated from the blue light source to prevent a decrease in the pure color.

Further, the fluorescent light reflected by the first optical axis conversion mirror 151a is condensed by the third convex lens 153c and is irradiated onto the third optical axis conversion mirror 151c. The fluorescent light is reflected by the third optical axis conversion mirror 151c and condensed by the fourth convex lens 153d, and then irradiated to the fourth optical axis conversion mirror 151d. Further, the fluorescent light is reflected by the fourth optical axis conversion mirror 151d, and is incident on the lens 154 by the light guiding means, and is incident on the light guiding means 75.

Further, the red light source light emitted from the second light source 82 and collected by the collecting lens group 155 penetrates the first optical axis conversion mirror 151a, and is transmitted through the third optical axis conversion mirror in the same manner as the green fluorescent light. When the 151c and the fourth optical axis conversion mirror 151d are guided, the third convex lens 153c, the fourth convex lens 153d, and the light guiding device are incident on the lens 154, and are incident on the light guiding device 75.

As described above, by constituting the collecting optical system, in the light emitted from the fluorescent dial 71, the blue light source light reflected from the fluorescent dial 71 is slightly present in addition to the green fluorescent light, but by the first light source 72. The first optical axis conversion mirror 151a as a dichroic mirror is disposed between the fluorescent dial 71 and the blue light source light reflected by the fluorescent dial 71 among the fluorescent light mixed in the green wavelength range, so that it can be provided. A light source device 63 and a projector 10 including the light source device 63, wherein the light source device 63 can emit light of a color having a high degree of pure chromaticity that can surely prevent the light source from being mixed into the fluorescent light.

Further, when the fluorescent dial 71 is rotated and light is emitted from the first light source 72 and the second light source 82 at different timings, light of a wavelength range of red, green, and blue is transmitted from the fluorescent dial 71 through the collecting optical system. The light guide device 75 is sequentially incident, and the DMD, which is the display element 51 of the projector 10, displays the color lights in a time-sharing manner based on the data, whereby a color image can be generated on the screen.

Further, the point-off operation of the first light source 72 and the second light source 82 is controlled by time division by the light source control means. As the control method, various aspects can be employed, but as shown in Fig. 6(a), for example, the light source control circuit 41 as a light source control means will be at the junction of the first region 1 and the second region 2 One of the centers is a fan-shaped area having a center angle of 120 degrees as a second light source lighting range, and the remaining area is used as a first light source lighting range. Thereby, when the fluorescent dial 71 rotates and is located at the center of the irradiation region 7 of the first light source 72 that is fixedly disposed on the second light source lighting range, the light source control means performs the first light source 72 to turn off and illuminate the second light source. When the center of the irradiation region 7 of the first light source 72 is located on the first light source lighting range, the control of the second light source 82 is turned off and the first light source 72 is turned on.

In this manner, the lighting operation of the first light source 72 and the second light source 82 is controlled by the light source control means. When the center of the illumination area 7 is located on the second light source lighting range, only the red light emitted from the second light source 82 is emitted ( R) is emitted from the light source device 63 through the collecting optical system and is incident on the light guiding device 75.

In addition, when the center of the irradiation region 7 is located on the first region 1 of the first light source lighting range, the blue light emitted from the first light source 72 is irradiated onto the phosphor layer 131, and the fluorescent light is received from the excitation light. Since the light body emits green fluorescent light, only the green fluorescent light (G) is emitted from the light source device 63 through the collecting optical system and is incident on the light guiding device 75. Further, as described above, the minute blue light component reflected to the side of the first light source 72 is separated from the green light by the first optical axis conversion mirror 151a.

In addition, when the center of the irradiation region 7 is located on the second region 2 of the first light source lighting range, the blue light emitted from the first light source 72 is irradiated onto the diffusion layer 141, and only diffuses through the diffusion layer 141. The blue light (B) is emitted from the light source device 63 through the collecting optical system and is incident on the light guiding device 75.

In other words, the lighting time of the first light source 72 and the second light source 82 is controlled by the light source control means, and red (R), green (G), and blue (B) light are sequentially emitted from the light source device 63. The projector 10 displays the incident color lights by the display means 51 in accordance with the data, whereby the color image can be generated on the screen.

Further, the second light source light-off range shown in the figure is configured such that the first light source 72 is turned off and the second light source 82 is turned on at the boundary between the two segment regions, but the second light source 82 is not limited thereto. At both the junctions of the two segmented regions, the first light source 72 is turned off, and the second light source 82 is illuminated, and the light source device 63 emits a predetermined wavelength range in the order of red, green, red, and blue. .

Further, in order to prevent the brightness from being lowered in a state where none of the first light source 72 and the second light source 82 is lighted, the light source control means turns off the light of either the first light source 72 and the second light source 82. The lighting and turning-off timings of the first light source 72 and the second light source 82 are controlled by lighting the light source of the other side a little earlier.

In addition, the second light source 82 that emits red light is provided as a monochromatic light source, and the first light source 72 and the second light source 82 can be individually controlled by the light source control means, so that the first light source 72 and the second light can be freely changed. The lighting time of the light source 82 provides a light source device 63 having a wide range of brightness modes.

The light source control means can also control the lighting time of the first light source 72 and the second light source 82 so as to shorten the emission time of each color light, and freely adjust the brightness. Further, as the configuration of controlling the first light source 72 or the second light source 82 by the light source control means so as to suppress the light source output only when light of a predetermined wavelength range is emitted, the color tone can be adjusted.

Further, the first light source 72 and the second light source 82 may be simultaneously illuminated only at a predetermined time, and the wavelength range light of the magenta (M) or yellow (Y) which is a complementary color may be emitted from the light source device 63. Specifically, as shown in FIG. 6(b), when the first light source 72 is lit and the blue light source is irradiated to the first region 1, the green light (G) is emitted, and when the light is rotated, the light source is lighted. When the second region 2 is irradiated, the blue light (B) is emitted. However, after the blue light of a predetermined time is emitted, if the second light source 82 is turned on, the blue light penetrating the fluorescent disk 71 and the second light source can be emitted. The red light emitted from 82 is combined, and a stable deep red wavelength range light (M) is emitted from the light source device 63 and incident on the light guiding device 75.

After the dark red light (M) for a predetermined time is emitted, if only the first light source 72 is turned off, the red light (R) from the second light source 82 is emitted from the light source device 63, and the red light is emitted for a predetermined time (R). Then, if the first light source 72 is turned on without turning off the second light source 82, the red light from the second light source 82 and the green light emitted from the fluorescent disk 71 can be combined to be emitted from the light source device 63. The yellow (Y) wavelength range of light is incident on the light guiding device 75.

In this manner, the light source control means individually performs the lighting control of the first light source 72 and the second light source 82 to light the light emitted from the first light source 72 and output from the fluorescent disk 71 only at a predetermined time. The light emitted from the light source 82 is combined to control the lighting of the first light source 72 and the second light source 82 at a predetermined timing for a predetermined period of time, thereby not only emitting the wavelength range of the primary color but also The light source device 63 emits light in the wavelength range of the complementary color, thereby improving the brightness of the light source device 63 and further improving the color reproducibility.

Further, as shown in FIGS. 4 and 6, the fluorescent dial 71 is not limited to being formed to have two segmented regions, and various configurations can be employed. For example, as shown in FIG. 7, three segmented regions may be formed on the fluorescent turntable 71, and a green phosphor layer 131 that emits green light as a reflecting portion is disposed in the first region 1, and the second region 2 is formed. As the light transmitting portion having the diffusion layer 141 through which the blue light is transmitted, the opaque portion that covers the mask 145 without penetrating the light from the first light source 72 is formed in the third region 3.

In this way, the illuminating portion that does not pass the light from the first light source 72 is formed by the predetermined segment region, and the second light source 82 is irradiated when the light of the first light source 72 is cut by the opaque portion. The red light (R) of the second light source 82 is emitted from the light source device 63 in a state where the first light source 72 is turned on.

Further, the phosphor layer 131 formed on the fluorescent dial 71 is not limited to the phosphor layer 131 that emits the fluorescent light of the green light band, and the phosphor layer 131 capable of emitting light of various wavelength ranges may be provided.

Further, the type of the light source is not limited to the above-described aspect, and a blue light-emitting diode may be employed for the first light source 72, and a laser illuminator for emitting laser light of a red light band may be used for the second light source 82. Moreover, since the first light source 72 is a blue laser illuminator, high-output excitation light can be emitted, and the phosphor can be efficiently excited. By using the red light-emitting diode as the second light source 82, it can be suppressed. The cost of the product.

Further, in the case where the first light source 72 and the second light source 82 are laser illuminators, the diffusion layer 141 is not provided in the light transmitting portion of the luminescent disk 71, but is formed by forming a frame on or around a normal glass plate. The light-transmitting portion is formed as a space of the through-hole, and the optical component to which the diffusion effect is applied is fixedly disposed on the side of the first light source 72 closest to the fluorescent dial 71, the emitting side of the fluorescent dial 71, or the second light source 82. The situation on the optical path of the laser light such as near the side. Further, in the case where the light-emitting diodes are both the first light source 72 and the second light source 82, the light source device 63 may not be provided with the diffusion layer 141 in the light transmitting portion or the optical path.

As described above, according to the present invention, it is possible to provide a light source device 63 and a projector 10 including the light source device 63. The light source device 63 includes a first light source 72 for exciting a phosphor, and a fluorescent disk 71 having good luminous efficiency. The phosphor of the type and the second light source 82 are monochromatic light sources, and a phosphor of a type having a low luminous efficiency, for example, a red phosphor, is formed on the fluorescent dial 71, but is emitted at a low level. The red wavelength range light corresponding to the luminous efficiency of the phosphor; thereby, the brightness of the screen can be improved.

In addition, since the light source light is irradiated to the fluorescent dial 71 at a predetermined timing, the time of irradiation to the fluorescent dial 71 can be reduced, and the temperature rise can be suppressed as compared with the case where the light is always irradiated onto the fluorescent dial 71. Therefore, it is possible to suppress a decrease in luminous efficiency due to an increase in temperature of the phosphor, and it is possible to improve the luminous efficiency of the phosphor.

Further, by using a laser illuminator of a blue light band as the first light source 72, the phosphor can be efficiently excited to emit light. Further, by forming the phosphor layer 131 having the phosphor emitting at least the green light band by the fluorescent dial 71, green wavelength range light as the primary color can be generated. Further, the diffusion layer 141 is provided in the light transmitting portion to allow the laser light having directivity to penetrate and diffuse, and the blue wavelength range light of the primary color can be used as the diffused light of the same as the fluorescent light, and can be incident on the light guiding device. 75.

Further, the concentrating optical system is not limited to the configuration shown in Fig. 5, and various optical configurations can be employed. Therefore, the light source device 63 can change the kind or arrangement of the first light source 72 and the second light source 82, the lens and the lens, and adopt various optical configurations, so as described above, not only the brightness of the screen can be improved, but also the mounting of the screen can be improved. The degree of freedom in arrangement of the machine such as the projector 10 of the light source device 63.

Further, the present invention is not limited to the above embodiments, and can be freely changed and improved without departing from the spirit and scope of the invention. For example, the light source control means may be provided not separately to the projector 10 but separately to the light source device 63.

Further, the segmented region formed on the substrate is not limited to the case of being formed in an aliquot, and may be formed by unequal division and four or more regions.

Further, in the above embodiment, the laser illuminator of the blue light band is used for the first light source 72. However, the present invention is not limited thereto, and a laser illuminator such as an ultraviolet ray band may be used. In this case, it is preferable that the phosphor layer 131 is disposed in the light transmitting portion of the fluorescent dial 71, and the phosphor layer emits light in a wavelength range different from the wavelength range of light emitted from the phosphor layer 131 formed in the reflecting portion. .

Further, in the above embodiment, the dichroic mirror is used in order to select the change of the optical axis direction, the light penetration or the reflection depending on the wavelength, but the present invention is not limited thereto, and other substitutions such as color separation can be used. Means to replace the above dichroic mirror.

Further, the second light source 82 is not limited to the case of emitting a light source of the red light band, and the fluorescent light emitted from the phosphor layer 131 and the first light source 72 may be used in addition to the red light band light. A source of light that emits light of a different wavelength range.

According to the present invention, there is provided a light source device and a projector including the light source device, the light source device comprising: a light source for exciting the phosphor; the fluorescent dial having a phosphor having a high luminous efficiency; and a monochromatic light source In addition, a phosphor of a type having a low luminous efficiency is not formed on the fluorescent dial, but a wavelength range light corresponding to the low luminous efficiency phosphor is emitted; thereby, the brightness of the screen can be improved.

In addition, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit and scope of the invention. Further, the functions executed in the above embodiments may be implemented as appropriate in an appropriate combination. The above embodiments include various stages, and various inventions can be obtained by a suitable combination of a plurality of constituent elements disclosed. For example, even if a plurality of constituent elements are deleted from the entire constituent elements disclosed in the embodiment, as long as an effect can be obtained, a configuration in which the constituent elements are deleted can be selected as the present invention.

1. . . First area

2. . . Second area

10. . . Projector

11. . . Upper panel

12. . . Front panel

14. . . Right side panel

15. . . Left panel

17. . . Vent

18. . . Suction hole

19. . . Lens cover

20. . . Terminal

twenty one. . . Input and output connector

twenty two. . . Input and output interface

twenty three. . . Image conversion unit

twenty four. . . Display encoder

25. . . Video RAM

26. . . Display driver

31. . . Image compression and decompression unit

32. . . Memory card

35. . . Ir receiving unit

36. . . Ir processing unit

37. . . Key/indicator

38. . . Control department

41. . . Light source control circuit

43. . . Cooling fan drive control circuit

47. . . Sound processing department

48. . . speaker

51. . . Display component

63. . . Light source device

70. . . Optical unit

71. . . Fluorescent turntable

72. . . First light source

73. . . Turntable motor

74. . . Optical axis changing mirror

75. . . Light guiding device

82. . . Second light source

90. . . Projection optical system

97. . . Movable lens group

131. . . Phosphor layer

141. . . Diffusion layer

150. . . Collimating lens

151. . . Optical axis conversion mirror

151a. . . First optical axis conversion mirror

151b. . . Second optical axis conversion mirror

151c. . . Third optical axis conversion mirror

151d. . . Fourth optical axis conversion mirror

153a. . . First convex lens

153b. . . Second convex lens

153c. . . Third convex lens

153d. . . Fourth convex lens

154. . . Light guiding device is injected into the lens

155. . . Condenser lens set

160. . . Mirror group

Fig. 1 is a perspective view showing the appearance of a projector including a light source device according to an embodiment of the present invention.

Fig. 2 is a view showing a functional circuit block of a projector having a light source device according to an embodiment of the present invention.

Fig. 3 is a schematic plan view showing the internal structure of a projector including a light source device according to an embodiment of the present invention.

4(a) and 4(b) are a front view showing a mode of a fluorescent dial according to an embodiment of the present invention and a schematic plan view showing a partial cross section.

Fig. 5 is a schematic plan view showing a light source device according to an embodiment of the present invention.

6(a) and 6(b) are schematic front views showing the fluorescent dial of the first light source and the second light source in the embodiment of the present invention.

Fig. 7 is a front elevational view showing the mode of the fluorescent dial of another embodiment of the light source device according to the embodiment of the present invention.

63. . . Light source device

71. . . Fluorescent turntable

72. . . First light source

73. . . Turntable motor

75. . . Light guiding device

82. . . Second light source

150. . . Collimating lens

151. . . Optical axis conversion mirror

151a. . . First optical axis conversion mirror

151b. . . Second optical axis conversion mirror

151c. . . Third optical axis conversion mirror

151d. . . Fourth optical axis conversion mirror

153a. . . First convex lens

153b. . . Second convex lens

153c. . . Third convex lens

153d. . . Fourth convex lens

154. . . Light guiding device is injected into the lens

155. . . Condenser lens set

160. . . Mirror group

Claims (7)

A light source device comprising: a light-emitting panel having a plurality of segmented regions on a substrate; and at least one of the plurality of segmented regions as a reflecting portion, wherein the reflecting portion is formed to receive excitation light and is issued a phosphor layer of light in a wavelength range, and at least one of the plurality of segment regions is a light transmitting portion that transmits light; and the first light source emits excitation light toward the phosphor layer and the light transmitting portion; The second light source emits light of a wavelength range different from the fluorescent light emitted from the phosphor layer and the excitation light emitted from the first light source; the collecting optical system is configured to emit light from the light emitting plate and The light emitted by the second light source is condensed on the same optical path; and the light source control means controls the light emission of the first light source and the second light source, the concentrating optical system includes: a dichroic mirror disposed on the first light source and Between the illuminating plates, the excitation light is transmitted through and reflects the fluorescent light from the phosphor layer; and the plurality of mirrors or dichroic mirrors are used to transmit the excitation light of the light transmitting portion of the illuminating plate. Fluorescent light reflected by a dichroic mirror And is emitted from the second light source and condensing the light emitted from the same optical path in the same direction. The light source device of claim 1, wherein the first light source is a laser illuminator of a blue light band. The light source device of claim 2, wherein the phosphor layer is A phosphor that receives at least excitation light and emits light in a green wavelength range. The light source device of claim 2, wherein the light-transmitting portion of the light-emitting panel is formed with a diffusion layer that diffuses light from the first light source. The light source device of claim 1, wherein the second light source is a light emitting diode of a red light band. The light source device of claim 1, wherein the illuminating plate has a circular plate shape and includes a driving device for rotating the illuminating plate in a circumferential direction. A projector comprising: a light source device according to any one of claims 1 to 6; a display element; a light source side optical system that directs light from the light source device toward the display element; and a projection side optical system The image emitted from the display element is projected on the screen; and the projector control means controls the light source device and the display element.